package day07;

import java.util.Random;
import java.util.Scanner;

/**
 * 需求：生成4位验证码
 */
public class VerificationCode {
    public static void main(String[] args) {
        Scanner scanner=new Scanner(System.in);
        String code=generteVeriCode(6);
        System.out.println("验证码为："+code);
    }
    /**生成验证码（大写字母，小写字母，数字）*/
    public static String generteVeriCode(int len){
        String code="";
        char[] chs={'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o',
                'p','q','r','s','t','v','u','w','x','y','z','A','B','C','D','E','F','G','H','I',
                'J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z','0','1','2',
                '3','4','5','6','7','8','9','达','内'};
        Random random=new Random();
        for (int i = 1; i <=len ; i++) {//len次
            //int index=(int)(Math.random()* chs.length);//随机下标
            int index=random.nextInt(chs.length);//随机下标
            code+=chs[index];//获取随机字符并拼接到code中
        }
        return code;
    }
}
